Using ropes and inflatable boats, firefighters rescued seven people and two dogs from the Sepulveda basin, a recreation and flood-control area along the Los Angeles River. One person was taken to a hospital with a non-life threatening injury.

The storm took aim at Southern California but also spread precipitation north into the San Joaquin Valley and up to San Francisco.

It was not expected to bring significant rain in the far north where damage to spillways of the Lake Oroville dam forced evacuation of 188,000 people last weekend.

The National Weather Service said it could end up being the strongest storm to hit Southern California since January 1995.

Hundreds of trees and dozens of power lines had toppled in the Los Angeles area and about 150,000 customers were without electricity across the region.

Another tree smashed a carport and vehicles in the Santa Barbara suburb of Goleta.